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In this talk, accessible to everyone, I will present ongoing research projects from the Northwestern Networks Group. In the first part of the talk, I will explain how you can use search engines to accurately classify Internet endpoints. Next, I will talk about the ISP-enabled behavioral ad targeting problem. In particular, I will explain how it is possible to extract user browsing patterns without violating wiretap laws which explicitly prohibit intercepting the contents of communication. In the second part of the talk, I will present our recent work on ‘serendipitous’ location-based services, i.e., those that foster accidental discovery of people, businesses and other locations around users that match their interests. I will particularly focus on characterizing the relationship between people’s application interests and mobility properties that we found by studying a population of over 280,000 users of a 3G mobile network in a large metropolitan area. Finally, I will briefly present our initial efforts on designing an infrastructure-less indoor positioning system.